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1. The human brain consumes about 20 watts and has a mass of 1-2 kilograms. a. Estimate the fraction of the body's power consumption used by the brain. (Hint: How can you estimate the power consumption of the whole body? What is something that you do know that might be a good approximation? Think about conservation of energy.) b. Compare the energy consumption per unit mass of the brain to the rest of the body.

1. The human brain consumes about 20 watts and has a mass of 1-2 kilograms. a. Estimate the fraction of the body's power consumption used by the brain. (Hint: How can you estimate the power consumption of the whole body? What is something that you do know that might be a good approximation? Think about conservation of energy.) b. Compare the energy consumption per unit mass of the brain to the rest of the body.

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Answer the following questions. Remember to explain your answer, any assumptions you may have made, etc. 1. The human brain consumes about 20 watts and has a mass of 1-2 kilograms. a. Estimate the fraction of the body's power consumption used by the brain. (Hint: How can you estimate the power consumption of the whole body? What is something that you do know that might be a good approximation? Think about conservation of energy.) b. Compare the energy consumption per unit mass of the brain to the rest of the body. 2. The cost the Apollo program that landed men on the moon was $25.4B. Using estimation compare the distance to the moon with the height of a stack of pennies that equals the cost of the program.
Transcribed Image Text:Answer the following questions. Remember to explain your answer, any assumptions you may have made, etc. 1. The human brain consumes about 20 watts and has a mass of 1-2 kilograms. a. Estimate the fraction of the body's power consumption used by the brain. (Hint: How can you estimate the power consumption of the whole body? What is something that you do know that might be a good approximation? Think about conservation of energy.) b. Compare the energy consumption per unit mass of the brain to the rest of the body. 2. The cost the Apollo program that landed men on the moon was $25.4B. Using estimation compare the distance to the moon with the height of a stack of pennies that equals the cost of the program.
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At repose, the average human generates roughly 100 watts of electricity an our brain uses around 20 watt of the power. There are two key considerations to bear in mind. This intense electrical power is required for the brain to function. And your mind is never turned off. Even while you're sleeping, your brain uses about the same amount of energy as it does during the day. Your neurons are continually conversing as you sleep, informing each other on what is going on. The majority of their energy is spent on continual alertness.

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